Brake shoe lining steippeb



Jan. 22, 1952 J, v, URBANO BRAKE SHOE LINING STRIPPER Filed Sept. 8 1949 2 SHEETS-SHEET l Jan. 22, 1952 J. v. URBANO' BRAKE SHOE LINING STRIPPER 2 SHEETS-SHEET 2 Filed Sept. 8, 1949 m a .wmj W] M V iatentecl Jan. 22, 1952 UNITED STATES PATENT OFFICE BRAKE SHOE LINING STRIPPER Joseph V. Urbano, Newark, N. J.

Application September 8, 1949, Serial No. 114,598

The invention relates to a special apparatus for stripping unserviceable linings from automobile brake shoes.

The current practice of adhesively bonding the lining to the circumferential faces of brake shoes, as an improvement upon the prior riveting meth od, has made removal of worn linings a laborious and time-consuming task generally involving the use of hammer and cold chisel.

It is, therefore, the primary object of the present invention to provide apparatus having means to revolve a brake shoe, including means to securely grip the shoe and rigidly hold the same against distortion and yielding shift, while a stripping tool is positioned to engage and accurately follow the line of cleavage between the shoe and its lining, so as to strip off the lining from the shoe, as the latter is revolved, by a single cutting movement; removal of the lining from the shoe by operation of the novel apparatus of this invention requiring only a fraction of the time and labor effort which is necessary in the practice of the old hand chipping method.

Another object is to provide an apparatus of the character above stated, which includes simple and interchangeable means for adapting the apparatus for operation upon brake shoes of different sizes.

An illustrative embodiment of the invention is shown in the accompanying drawings, in which:

Fig. 1 is a front elevation of a brake shoe lining stripper apparatus, according to the invention;

Fig. 2 is a top plan view of the same, with parts shown in section;

Fig. 3 is a fragmentary sectional view, with parts shown in elevation, taken on line 3 -3' in Fig. 2 and Figs. 4 and 5 are respectively elevational views of the shoe carrierand cooperative clamp plate, showing the respective faces thereof which are opposed one to the other in use for operative gripping and holding of a brake shoe from which the lining is desired to be removed.

In an apparatus for stripping unserviceable linings from brake shoes, there is a controlling factor which must be borne in mind. A brake shoe is a precision product. Regardless of size, or radius of curvature, its circumferential face to which the friction lining is bonded will have the form of a perfect cylinder throughout its length. This is essential to smooth braking contact between the shoe lining and a coacting brake drum. Consequently, the stripping apparatus must incorporate means whereby the original 2 Claims. (Cl. 164-38) form of each shoe operated upon will be preserved against distortion or mutilation of its circumferential face. As will become more clearly apparent presently, it is important that the cooperative shoe seating and clamping means of the stripping apparatus will fulfill this requirement; and has been designed with that end in view; other structural details and operative movements of the apparatus are subservient to that fundamental feature.

Referring now to the drawings, wherein like characters of reference indicate corresponding parts in the several views, the character H1 designates the preferably elongatedbase or bed of the apparatus. The apparatus is small and light enough to be portable but may, when desired, be bolted to a work bench or other support by use of the apertured lugs H with which the base is provided.

Rising from one end of bed I0 is an immovable pedestal I2 which supports gear box I3. A horizontal driven shaft or spindle I4 is journaled in suitable bearings [5 in gear box l3, and has one end projecting forwardly therefrom. Inorder that shaft l4 may be driven by hand slowly but end, a shoe carrier ll of special construction is provided, and is adapted to be attached to the driven shaft M for rotation therewith. Actually, it is desirable to provide a plurality of interchangeable shoe carriers of difierent sizes to respectively accommodate brake shoes of the several standard sizes, i; e., according to radii of their circumferential lined braking faces. The several shoe carriers constitute a matched set that is kept available for selective use of a particular shoe carrier that is appropriate for a particular brake shoe.

Since each brake shoe, of the well-known type illustrated in the drawings, comprises an arouate body portion l3 of uniform thickness and an internal medial reinforcing rib it which is substantially coextensive and integral with said body portion, advantage has been taken of these structural details of the brake shoe, in designing each carrier to conform to and fit a shoe of given size. Each brake shoe, in any size thereof, extends approximately only one-third of the circumference of a circle, so considerable weight has been saved by making each carrier l1 in fiat segmental form as shown particularly in Figs. 1 and 4. The periphery of carrier H is shaped to form a supporting seat [9 ,which conforms to and snugly fits against the inner face of the body portion is of a brake shoe of a given standard size. Shoe carrier H is provided concentric to arcuate seat-gi with a hub formation 11 havingan axialattach ing socket 23 adapted to fit over the'protruding end of driven shaft l4.

To detachably connect agiven sho rrier III to the driven shaft l4, whereby the formerean be operatively rotated by the latter whenfi fifi i' paratus is in use, a coupling means is provided. In one illustrative fcrmi of such coupling means, a o m. I. a c. v .4 is fixed on 'dr'ivn shaft "I 4' withfa's'e. g. by'a cross-pin '22. so as pfqjbdtfrdlh the hub .11.

carrier, parallel rt "the A or more coupling, pin dowlsjfi. w en ,the shoe carrier n me nsa "m, and thrust honie thereon, o riddwel's 23 are caused to enter an S5211; .w1thin fcorre'sp'onding socket or sockets 24 with hich'tlieldriven collar 21 is provided, thus, transmittihg "through the latter the ear ihdtioi'f'f the shaft 14 to the shoefcarrier l1,

when a brake fishes i9 of "a shoece'rri rest is earer said carrier, asfs own .fi'ar c'ularly. in Fig. 2, rib I8 affords convenient "means by 'whi'ch'the shoe is attached. to the carrier inoperati'o'rial posi- 7 tion. To bind thebrakesli'o'e'tb Tthefcai rir I'I,

edge "of clamp '25 "is cdrifdririable to the "interior U I c [8 cannot iie'cessarny to contact there ith. "Ad

face of brakefshoebod exit to; its peripheral de'd with an arch- 1 ate 'r'owbf iiiwaidly 'prpjecun g ippm studs 21 that .p 'eierab1y.,i1a\i harp, pointe "free "ends adapted "meiigag me rib "I B'T'of brakeflshoe 1 8. For convenience "of replacement, it is desirable to threadea'ch stud 2'1 intoclahipl late 25. v Two of these gripping stfidsilwhen' suitablyfspaoed apart, are sufficient. to afford uniform"and unyielding'gripp'mgengagement of damp 'plate 25 with thefshde rib 8. Ihwar'dlyof studs '21 and preferably fadj a'cent to attaching socket 20,. shoe carrier 11 "is -proifided, ion itsbrake shoe engaging face, with apro ectingjrulcrum m za that is adapted to bear against" the inner face of clamp of screws 29' and'cooperating nuts ZS'Iclam p plate '25 may be rocked onlug 28 as a fulcrum'tojpress studs '21tiglitly against'shoe rib [Bf and thereby strongly grip thesh de as'aT lioleto sclurely hold theisame in supportedfpisltionfaiid"against"dis fift h ids jof rbtation, are one Jengagement with slide 3|. pos ed manipulating knob 36 is fixed on outer end "of adjusting "screw 35 for manipulation of the At the end of bed l0, opposite to pedestal l2, a tool head 30 is stationarily disposed. A slide 3|, which is horizontally movable in head 30 toward and away from a shoe carrier operatively mounted on the shaft I4, has an inclined socket 32 at its outer free end for reception of a suitable stripping blade 33. A clamping bolt 34 is provided in the outer end portion of slide 3! for the purpose of clamping .tool 33 rigidly in socket 32. At the outer end of tool he'adJ3l), an adjusting screw 35 is rotatably mounted for screw-threaded An exteriorly dislatter to feed the tool slide in and out as may be required to dispose the cutting edge of the stripping blade 33*at"th"e line of cleavage between the brakeshoe I8 and its lining L desired to be operated upon for stripping the latter from the former. A set screw 3l'has been provided in tool head 30 for locking engagement with tool slide 35 in order th'at'the latter maybe secured in adjusted position for operative disposition of the blade 33.

Stripping tool 33 shouldbe of such length that its sharpened cutting edge 33 will be located substantially in a plane which intersects the'axi's of driven shaft I4. The. cutting edge should be straight and, of a 'width at least equal to and preferably substantially greater than the width of body !8 'ofthe largest brake shoe that may be operated upon by the, apparatus.

The operation of the apparatus will now be described. When thelining L is to be removed from a particular brakeshoe [8, a 'shoe carrier H of appropriate. ,size is selected from the matched set "thereof and is applied to driven shaft M in such a maiiherthat coupling pins 23 of the shoe carrier. will'enter sockets 24 of collar 2|, and thus "afi'ix the 'shoe carrier on the shaft It so as to be rotated thereby. Then, the brake shoe is fitted'a'gainst the'seat I9 of shoe carrier l1, and clamp plate 25 is assembled with said shoe carrier. Whiletl'i'e shoe is held in firm, contactin'g engagement with said seat, He, the nuts 29 are turned home on the clamping screws 29 until the brakeshoe rib it has become tightly gripped between studs 2,! of the clamp'plate 25 and the opposed ,fa'c'e ofv shoe carrier. In this clamped position, the'brake shoe will berigidly supported throughout its length, andjfirmly held against any forces "which would tend eitherto distort it fromits normal form, or to cause yielding shift thereof. c 7

By means of crank handle it shaft I4 can be rotated, so that the revolved shoe carrier will bring the leading end of brake shoe [8 into starting position immediately above the level of the cuttingedge 33.. of stripping, blade 3E1. Thereafter, manipulation iof the knob 36 operates the adjusting screw '35 to move tool slide 3| inward toward shoe carrierj I] .u'n'tilthe cutting edge 33' of blade 33 is precisely tangential to the'circumferential face of'the body of the brake shoe [8. Whenthis blade'setting has been accomplished, set screw 31 should be, tightened to insure that the slide 3| cannot, creep orba'ck off under pressure, which is most likely'to occur if, the threads of adjusting screw 35 become worn with use.

Now, crank handle I may be operated torotate shaft l4 and sho'e'carrier' I! slowly and with awayirom the' br'ake shoe ody. At the outset'of sure that the cutting edge 33' of blade 33 is following the line of cleavage without objectionable scraping of the periphery of saidv brake shoe body. When accurately set, the blade will cut into nothing but the adhesive substance that bonds the lining L to the brake shoe body face, since the brake shoe has been fitted properly firmly upon the seat of the shoe carrier H.

The provision of shoe carriers of different sizes not only serves to accommodate the apparatus to the various standard sizes of brake shoes but also reduces the degree of precise adjustment of the tool slide required at the time of making a change from one size brake shoe to another. The substitution of one carrier for another effects rough adjustment of the work with reference to the blade, whereupon only minor precision adjustment of the tool .slide is necessary to place the blades cutting edge in proper relation to the line of cleavage of the linin of a brake shoe desired to be operated upon.

Having now described my invention, I claim:

1. In apparatus for stripping the bonded linings from brake shoes by means of a stripping tool blade supported to present its cutting edge tangent to the face of a brake shoe body as operated upon by the apparatus, a rotatably mounted driven shaft, a brake shoe carrier having an arcuate external seating face adapted to fit the internal face of a brake shoe body and an axial attaching socket concentric to the seating face adapted to receive the driven shaft, means for connecting the carrier to the driven shaft for rotation therewith, and clamping means associated with the carrier for securing a brake shoe fixedly in operational position on the seating face thereof, said clamping means comprising a clamping plate opposed to the outer side of the carrier for reception of the medial rib of a brake shoe body therebetween, an arcuate row of spaced gripping studs projecting from the inner side of the clamping plate whereby to engage and grip the brake shoe rib, a fulcrum lug projecting from the carrier to pivotally support said clamping plate, and clamp bolt means extending from said carrier through the clamping plate and located intermediate the row of gripping studs and said fulcrum lug, said clamp bolt means being operative to draw the clamping plate and its gripping studs toward the carrier whereby to grip the brake shoe rib therebetween.

2. In apparatus for stripping the bonded linings from brake shoes by means of a stripping tool blade supported to present its cutting edge tangent to the face of a brake shoe body as operated upon by the apparatus, a shaft, means for driving said shaft, a brake shoe carrier fixed on the said shaft, said carrier having an arcuate peripheral seat concentric to the shaft upon which the inner face of a brake shoe body can be seated for the support of said body, and means to clamp the brake shoebody to the carrier comprising a clamping plate opposed to the outer side of the carrier for reception of the medial rib of the brake shoe body therebetween, an arcuate row of spaced gripping studs projecting from the inner side of the clamping plate whereby to engage and grip the brake shoe rib, a fulcrum lug projecting from the carrier to pivotally support said clamping plate, and clamp bolt means extending from said carrier through the clamping plate and located intermediate the row of gripping studs and said fulcrum lug, said clamp bolt means being operative to draw the clamping plate and its gripping studs toward the carrier whereby to grip the brake shoe or rib therebetween.

JOSEPH V. URBANO.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 30,736 Keen -1 Nov. 27, 1860 100,771 Kavanagh Mar. 15, 1870 1,653,104 Kimmerling Dec. 20, 1927 

